Trouble shooting 14
OUTDOOR UNIT Error Method:
OK
OK
12.616.1
5
20.726.935.246.662.3115.2Resistance value (k )
0-5-10-20Temperature (°C )
10 2015
1.62.43.55.28.0Resistance value (k )
7060504030Temperature (°C )
Outdoor Thermistor Error
Outdoor Unit Main PCB
Outdoor Temperature Thermistor
When Outdoor Temperature Thermistor open or short-circuit
is detected at power ON or while running the compressor.
1. Connector connection failure 2. Thermistor failure 3. Main PCB failure
Test 1 : Check connection of connector
Check if connector is removed.
Check if connector is erroneous connection.
Check if thermistor cable is open.
>>
Upon correcting the removed connector or miss-wiring, reset the power.
Test 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Test 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
If the voltage does not appear, replace Main PCB.
Temperature (°F ) -4 14 23 32 41 50 59 68
Temperature (°F ) 86 104 122 140 158
CN64
CN62
1
2
1
2
33
1
2
1
2
33
BLUE
BLUE
BROWN
BROWN
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( COMPRESSOR TEMP. )
CN65
CN63
1
2
1
2
33
1
2
1
2
33
BROWN
BROWN
BLACK
BLACK
THERMISTOR
( DISCHARGE TEMP. )
THERMISTOR
( PIPE TEMP. )
02-16
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit : Operation lamp: 7 times Flash, Timer lamp: 4 times Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 74]
Detective Actuators: Detective details:
Forecast of Cause: